Updated April 3, '06:
http://www.practical-home-theater-guide.com/hdmi-cable.htmlIs a digital connection better than an analog connection? The answer is not that simple.
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The primary reason for the HDMI standard's existence is copy protection (HDCP), and everything else is secondary thereto.
According to the linked article, component cables offer a tighter control over cable impedance than HDMI cables. Instead of coaxial cables, the HDMI cable standard uses twisted copper pairs. "The problem with twisted pair is that it is not possible to maintain the same tight control over impedance as instead is possible with coaxial cables. ... (P)oor impedance control leads to signal reflections along a DVI or HDMI cable between source and sink, interfering with the bitstream originating from the source."
Despite this, manufacturers insist on passing upconverted and high definition signals only on HDMI. Why? Because it's what the studios want. Why? Because the studios want the copy protection that HDMI can provide.
As early as last year, digitaltrends.com's Dennis Barker wrote:
"Why won’t these new players (or future recorders) pass along a 1080i signal? Because component video is an analog connector, not a digital one. The content providers (Hollywood Studios) are so concerned about piracy that they want the hardware manufacturers to turn off component video altogether. ... This is a major dilemma, and no one is talking about it. The content providers want all audio and video signals sent via HDMI, as it features robust copy protection and it’s an all digital connector (versus the old analog component video connector)." (The Impeding Dilemma of Component Video; Dennis Barker; February 19th, 2006;
http://news.digitaltrends.com/talkback102.html)